i picked up several motorola hands free kits...for the k2 for under 3$ each ...shipped....they have a 2x6 WATT amp inside.. just reconnectorize , apply 12 vdc.( alot of current) and stand back even has a regulated 6.25out.... still have some pix on line,,, with part #s https://picasaweb.google.com/Bill.SteffeySr/SpkrForWayne .... bill..